BUG: KASAN: use-after-free in atomic_dec include/asm-generic/atomic-instrumented.h:114 [inline]
BUG: KASAN: use-after-free in usb_audio_probe+0xee7/0x2220 sound/usb/card.c:687
Write of size 4 at addr ffff88012f91d114 by task test/5641

CPU: 2 PID: 5641 Comm: test Not tainted 4.18.19 #1
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Ubuntu-1.8.2-1ubuntu1 04/01/2014
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0xf2/0x188 lib/dump_stack.c:113
 print_address_description+0x71/0x239 mm/kasan/report.c:256
 kasan_report_error mm/kasan/report.c:354 [inline]
 kasan_report.cold.6+0x242/0x2fe mm/kasan/report.c:412
 check_memory_region_inline mm/kasan/kasan.c:260 [inline]
 check_memory_region+0x13e/0x1b0 mm/kasan/kasan.c:267
 kasan_check_write+0x14/0x20 mm/kasan/kasan.c:278
 atomic_dec include/asm-generic/atomic-instrumented.h:114 [inline]
 usb_audio_probe+0xee7/0x2220 sound/usb/card.c:687
 usb_probe_interface+0x324/0x940 drivers/usb/core/driver.c:361
 really_probe drivers/base/dd.c:438 [inline]
 driver_probe_device+0x598/0x7f0 drivers/base/dd.c:580
 __device_attach_driver+0x25f/0x2e0 drivers/base/dd.c:676
 bus_for_each_drv+0x124/0x190 drivers/base/bus.c:461
 __device_attach+0x1ca/0x2d0 drivers/base/dd.c:733
 device_initial_probe+0x1f/0x30 drivers/base/dd.c:780
 bus_probe_device+0x200/0x2b0 drivers/base/bus.c:521
 device_add+0x8b5/0x1460 drivers/base/core.c:1875
 usb_set_configuration+0xd5f/0x1780 drivers/usb/core/message.c:2014
 generic_probe+0xbb/0x120 drivers/usb/core/generic.c:174
 usb_probe_device+0xb4/0x110 drivers/usb/core/driver.c:266
 really_probe drivers/base/dd.c:438 [inline]
 driver_probe_device+0x598/0x7f0 drivers/base/dd.c:580
 __device_attach_driver+0x25f/0x2e0 drivers/base/dd.c:676
 bus_for_each_drv+0x124/0x190 drivers/base/bus.c:461
 __device_attach+0x1ca/0x2d0 drivers/base/dd.c:733
 device_initial_probe+0x1f/0x30 drivers/base/dd.c:780
 bus_probe_device+0x200/0x2b0 drivers/base/bus.c:521
 device_add+0x8b5/0x1460 drivers/base/core.c:1875
 usb_new_device+0x9f9/0x1f30 drivers/usb/core/hub.c:2563
 hub_port_connect drivers/usb/core/hub.c:5067 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5182 [inline]
 port_event drivers/usb/core/hub.c:5290 [inline]
 hub_event_impl+0x189b/0x3670 drivers/usb/core/hub.c:5402
 uf_hub_events_handle+0x504/0x53e drivers/usb/core/hub.c:1874
 hub_ioctl+0x4fb/0x550 drivers/usb/core/hub.c:1924
 proc_ioctl+0x3e1/0x610 drivers/usb/core/devio.c:2187
 proc_ioctl_default drivers/usb/core/devio.c:2210 [inline]
 usbdev_do_ioctl+0x61a/0x2e20 drivers/usb/core/devio.c:2524
 usbdev_ioctl+0x2a/0x40 drivers/usb/core/devio.c:2568
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:500 [inline]
 do_vfs_ioctl+0x16d/0x1160 fs/ioctl.c:684
 ksys_ioctl+0xae/0xd0 fs/ioctl.c:701
 __do_sys_ioctl fs/ioctl.c:708 [inline]
 __se_sys_ioctl fs/ioctl.c:706 [inline]
 __x64_sys_ioctl+0x78/0xb0 fs/ioctl.c:706
 do_syscall_64+0xd4/0x4e0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x452d07
Code: 48 83 c4 08 48 89 d8 5b 5d c3 66 0f 1f 84 00 00 00 00 00 48 89 e8 48 f7 d8 48 39 c3 0f 92 c0 eb 92 66 90 b8 10 00 00 00 0f 05 <48> 3d 01 f0 ff ff 0f 83 7d bb fb ff c3 66 66 66 2e 0f 1f 84 00 00 
RSP: 002b:00007fff9dea3de8 EFLAGS: 00000206 ORIG_RAX: 0000000000000010
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000452d07
RDX: 00007fff9dea3e00 RSI: 00000000c0105512 RDI: 0000000000000000
RBP: 0000000020004ff2 R08: 0000000020000a74 R09: 0000000020001000
R10: 0000000000000004 R11: 0000000000000206 R12: 0000000000000074
R13: 0000000020000a74 R14: 0000000000000004 R15: 0000000000000003

Allocated by task 5641:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:448
 set_track mm/kasan/kasan.c:460 [inline]
 kasan_kmalloc+0xc7/0xe0 mm/kasan/kasan.c:553
 __kmalloc+0x161/0x330 mm/slub.c:3753
 kmalloc include/linux/slab.h:518 [inline]
 kzalloc include/linux/slab.h:707 [inline]
 snd_card_new+0x92/0x8b0 sound/core/init.c:214
 snd_usb_audio_create sound/usb/card.c:475 [inline]
 usb_audio_probe+0x12da/0x2220 sound/usb/card.c:621
 usb_probe_interface+0x324/0x940 drivers/usb/core/driver.c:361
 really_probe drivers/base/dd.c:438 [inline]
 driver_probe_device+0x598/0x7f0 drivers/base/dd.c:580
 __device_attach_driver+0x25f/0x2e0 drivers/base/dd.c:676
 bus_for_each_drv+0x124/0x190 drivers/base/bus.c:461
 __device_attach+0x1ca/0x2d0 drivers/base/dd.c:733
 device_initial_probe+0x1f/0x30 drivers/base/dd.c:780
 bus_probe_device+0x200/0x2b0 drivers/base/bus.c:521
 device_add+0x8b5/0x1460 drivers/base/core.c:1875
 usb_set_configuration+0xd5f/0x1780 drivers/usb/core/message.c:2014
 generic_probe+0xbb/0x120 drivers/usb/core/generic.c:174
 usb_probe_device+0xb4/0x110 drivers/usb/core/driver.c:266
 really_probe drivers/base/dd.c:438 [inline]
 driver_probe_device+0x598/0x7f0 drivers/base/dd.c:580
 __device_attach_driver+0x25f/0x2e0 drivers/base/dd.c:676
 bus_for_each_drv+0x124/0x190 drivers/base/bus.c:461
 __device_attach+0x1ca/0x2d0 drivers/base/dd.c:733
 device_initial_probe+0x1f/0x30 drivers/base/dd.c:780
 bus_probe_device+0x200/0x2b0 drivers/base/bus.c:521
 device_add+0x8b5/0x1460 drivers/base/core.c:1875
 usb_new_device+0x9f9/0x1f30 drivers/usb/core/hub.c:2563
 hub_port_connect drivers/usb/core/hub.c:5067 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5182 [inline]
 port_event drivers/usb/core/hub.c:5290 [inline]
 hub_event_impl+0x189b/0x3670 drivers/usb/core/hub.c:5402
 uf_hub_events_handle+0x504/0x53e drivers/usb/core/hub.c:1874
 hub_ioctl+0x4fb/0x550 drivers/usb/core/hub.c:1924
 proc_ioctl+0x3e1/0x610 drivers/usb/core/devio.c:2187
 proc_ioctl_default drivers/usb/core/devio.c:2210 [inline]
 usbdev_do_ioctl+0x61a/0x2e20 drivers/usb/core/devio.c:2524
 usbdev_ioctl+0x2a/0x40 drivers/usb/core/devio.c:2568
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:500 [inline]
 do_vfs_ioctl+0x16d/0x1160 fs/ioctl.c:684
 ksys_ioctl+0xae/0xd0 fs/ioctl.c:701
 __do_sys_ioctl fs/ioctl.c:708 [inline]
 __se_sys_ioctl fs/ioctl.c:706 [inline]
 __x64_sys_ioctl+0x78/0xb0 fs/ioctl.c:706
 do_syscall_64+0xd4/0x4e0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

Freed by task 5641:
 save_stack+0x43/0xd0 mm/kasan/kasan.c:448
 set_track mm/kasan/kasan.c:460 [inline]
 __kasan_slab_free+0x139/0x190 mm/kasan/kasan.c:521
 kasan_slab_free+0xe/0x10 mm/kasan/kasan.c:528
 slab_free_hook mm/slub.c:1373 [inline]
 slab_free_freelist_hook mm/slub.c:1400 [inline]
 slab_free mm/slub.c:2955 [inline]
 kfree+0x107/0x310 mm/slub.c:3908
 snd_card_do_free sound/core/init.c:501 [inline]
 release_card_device+0x116/0x180 sound/core/init.c:181
 device_release+0x83/0x210 drivers/base/core.c:850
 kobject_cleanup lib/kobject.c:643 [inline]
 kobject_release lib/kobject.c:672 [inline]
 kref_put include/linux/kref.h:70 [inline]
 kobject_put+0x198/0x290 lib/kobject.c:689
 put_device+0x25/0x30 drivers/base/core.c:1972
 snd_card_free_when_closed sound/core/init.c:519 [inline]
 snd_card_free+0x9a/0xd0 sound/core/init.c:544
 usb_audio_probe+0x108f/0x2220 sound/usb/card.c:686
 usb_probe_interface+0x324/0x940 drivers/usb/core/driver.c:361
 really_probe drivers/base/dd.c:438 [inline]
 driver_probe_device+0x598/0x7f0 drivers/base/dd.c:580
 __device_attach_driver+0x25f/0x2e0 drivers/base/dd.c:676
 bus_for_each_drv+0x124/0x190 drivers/base/bus.c:461
 __device_attach+0x1ca/0x2d0 drivers/base/dd.c:733
 device_initial_probe+0x1f/0x30 drivers/base/dd.c:780
 bus_probe_device+0x200/0x2b0 drivers/base/bus.c:521
 device_add+0x8b5/0x1460 drivers/base/core.c:1875
 usb_set_configuration+0xd5f/0x1780 drivers/usb/core/message.c:2014
 generic_probe+0xbb/0x120 drivers/usb/core/generic.c:174
 usb_probe_device+0xb4/0x110 drivers/usb/core/driver.c:266
 really_probe drivers/base/dd.c:438 [inline]
 driver_probe_device+0x598/0x7f0 drivers/base/dd.c:580
 __device_attach_driver+0x25f/0x2e0 drivers/base/dd.c:676
 bus_for_each_drv+0x124/0x190 drivers/base/bus.c:461
 __device_attach+0x1ca/0x2d0 drivers/base/dd.c:733
 device_initial_probe+0x1f/0x30 drivers/base/dd.c:780
 bus_probe_device+0x200/0x2b0 drivers/base/bus.c:521
 device_add+0x8b5/0x1460 drivers/base/core.c:1875
 usb_new_device+0x9f9/0x1f30 drivers/usb/core/hub.c:2563
 hub_port_connect drivers/usb/core/hub.c:5067 [inline]
 hub_port_connect_change drivers/usb/core/hub.c:5182 [inline]
 port_event drivers/usb/core/hub.c:5290 [inline]
 hub_event_impl+0x189b/0x3670 drivers/usb/core/hub.c:5402
 uf_hub_events_handle+0x504/0x53e drivers/usb/core/hub.c:1874
 hub_ioctl+0x4fb/0x550 drivers/usb/core/hub.c:1924
 proc_ioctl+0x3e1/0x610 drivers/usb/core/devio.c:2187
 proc_ioctl_default drivers/usb/core/devio.c:2210 [inline]
 usbdev_do_ioctl+0x61a/0x2e20 drivers/usb/core/devio.c:2524
 usbdev_ioctl+0x2a/0x40 drivers/usb/core/devio.c:2568
 vfs_ioctl fs/ioctl.c:46 [inline]
 file_ioctl fs/ioctl.c:500 [inline]
 do_vfs_ioctl+0x16d/0x1160 fs/ioctl.c:684
 ksys_ioctl+0xae/0xd0 fs/ioctl.c:701
 __do_sys_ioctl fs/ioctl.c:708 [inline]
 __se_sys_ioctl fs/ioctl.c:706 [inline]
 __x64_sys_ioctl+0x78/0xb0 fs/ioctl.c:706
 do_syscall_64+0xd4/0x4e0 arch/x86/entry/common.c:290
 entry_SYSCALL_64_after_hwframe+0x49/0xbe

The buggy address belongs to the object at ffff88012f91c400
 which belongs to the cache kmalloc-4096 of size 4096
The buggy address is located 3348 bytes inside of
 4096-byte region [ffff88012f91c400, ffff88012f91d400)
The buggy address belongs to the page:
page:ffffea0004be4600 count:1 mapcount:0 mapping:ffff880064802c00 index:0x0 compound_mapcount: 0
flags: 0x600000000008100(slab|head)
raw: 0600000000008100 0000000000000000 0000000100000001 ffff880064802c00
raw: 0000000000000000 0000000080070007 00000001ffffffff 0000000000000000
page dumped because: kasan: bad access detected

Memory state around the buggy address:
 ffff88012f91d000: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88012f91d080: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
>ffff88012f91d100: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
                         ^
 ffff88012f91d180: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
 ffff88012f91d200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
==================================================================